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Respiratory
Alternate Names : Respiration
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Lower Respiratory Tract
Today's Top News Stories | • | Officials Still Seek Source of Salmonella Outbreak - Jan 09, 2009, 14:00
Almost 400 Americans in 42 states have been sickened. | • | Clinical Trials Update: Jan. 9, 2009 - Jan 09, 2009, 10:05
- Fungal Infections
- Post Menopause
- Irritable Bowel Syndrome (IBS)
| • | Americans Consuming More Sugary Beverages - Jan 09, 2009, 12:00
Adults gulping an average of 300 calories every day, study finds. | • | Garlic as a Cancer Fighter? Maybe Not - Jan 09, 2009, 16:00
Evidence that strong-smelling herb prevents cancer is said to be weak.
| • | Antipsychotics Up Death Risk in Alzheimer's Patients - Jan 09, 2009, 09:00
Long-term study says the drugs should only be used short-term, as last resort. |
The major passages and structures of the lower respiratory tract include the windpipe (trachea) and within the lungs, the bronchi, bronchioles, and alveoli. Deep in the lungs, each bronchus divides into secondary and tertiary bronchi, which continue to branch to smaller airways called the bronchioles. The bronchioles end in air sacs called the alveoli. Alveoli are bunched together into clusters to form alveolar sacs. Gas exchange occurs on the surface of each alveolus by a network of capillaries carrying blood that has come through veins from other parts of the body.
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- Lungs
- Upper Respiratory Tract
- Lower Respiratory Tract
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Review Date : 4/22/2003
Reviewed By : David A. Kaufman, M.D., Pulmonary & Critical Care Medicine, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
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